Head-wall structure for culverts



7 March- 8, 1927.v

1,620,089 A. F. FISCHER HEADWALL STRUCTURE FOR CULVERTS Filed Dec. 23, 1924 E @Em Patented Mar. 8, 1927.

PATENT OFFICE.

ALBERTF. FISCHER, OF MASON CITY, IOWA.

HEAD-warn srancrnan ron cunvna'rs.

Application filed December 23, 1924. Serial No. 757,584.

The object of my invention is to provide a head wall construction for culverts of simple, durable and comparatively inexpensive construction.

More particularly, my invention relates to a head wall structure arranged to prevent the sloping banks along the ends of the .culverts from dropping into the culvert, and at the same time, to provide a downwardly extending apron at the bottom of the head wall structure for preventing the undermining of the dirt below the head wall structure and the culvert itself.

Still a further object is to provide a head wall structure arranged to be bent out of a flat sheet of iron to form a flat bottom, and side and top walls which are curved from one end of the bottom to the other, and bent upwardly and outwardly so that the mouth of the head wall structure is of substantially greater area than the inner end thereof, which fastens to the end of the culvert.

Still a further object is to provide a marginal flange circular in outline on the inner end of the structure, which is adapted to fit around the end of the culvert and be secured thereto for retaining the headwall structure in pro er .position.

- With these an other objects in view, my

invention consists in the construction, ar-

rangement'and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, ointed out in my claim, and illustrated in t e accompanying drawings, in which:

Figure 1 is a top, plan view of an end, of a corrugated culvert with my improved head ,wall structure secured thereto.

Fi re 2 is an end viewof the outer or mout end of the head wall structure.

Figure 3 is a central, sectional view taken on line 3-3"of Figure 2.

Figure 4 is a detail, sectional view taken on line 4-4 of Figure 3 showing ,the bolt connections for securing the two ends of the head wall structure together; and

Figure 5 is a detail, sectional view similar to F1 re 3 with the head wall structure riveteg or permanently fastened to ether. In the accompanying drawings, have used the reference numeral 10 to indicate generall a corrugated culvert adapted to extend From one side of the road 11 to the other side thereof in the ordinary manner. My headwall structure is desi ed to be secured to the ends of the culvert 10 and adapted to project into the sloping bank 12 of the road 11.

My improved head wall structure is formed of a flat sheet of iron 13 bent to form a flat bottom 14 of considerable width from end to end. i

The sheet 13 is then bent upwardly to form end walls 15, which are connected to-- gcther by a curved top or upper wall 16.

It may be here mentioned that the side walls 15 and the top walls 16 are practically curved from one end of the bottom 14 to.

the other end of thebottom 14, as clearly shown in Figure 2 of the drawings.

The side-walls 15 and the top wall 16 are inclined upwardly and outwardly from their inner end so as to form an opening on the inner end of less area than the area of the mouth. or outer end of the head wall strucreinforcing flange 19 for giving rigidity and strength to the head wall structure, which is adapted to support the dirt thereabove and to prevent crushing of dirt pressure on the sides thereof.

The bottom 14 is formed with a downwardly extending apron 20, which is desirable to be embedded in the dirt for preventing the underminin and washing away of the dirt below the ottom 14 and the culvert 10.

The outer edge of the curved top 16 is inclined so as to conform to the sloping bank 12, as clearly shown in Figure 3 of the drawings.

By curving the top 16 and then inclining it upwardly and outwardly, gives me a very substantial structure which supports the dirt thereabove and prevents it from passing into the culvert 10.

The top 16 is formed by bringin the two ends of the sheet 13 to ether and la ping them over, as shown in lgure 5 of the rawings', giving me what may be properly termed an expansible joint.

In order to hold head wall structures in position, I provide a pair of apertured flanges 21, whichare riveted or otherwlse secured to the adjacent ends of the sheet 13 and having a threaded rod I 22 extended I therethrough. 1

Nuts 23 are mounted on the opposite sides of the apertured flanges 21 and are threaded on the rod 22.

..mitting the insertion of the culvert 10 into the opening 17 and to be surrounded by the marginal flange 18. i t

In Figure 5 of the drawings. I have shown a slightly modified form of head wall structure wherein the ends of the sheet 13 are riveted together and the opening 17 is of a fixed diameter.

In order to insert the culvert 10 into. the head-wall structure of the type shown in Figure 5, it is necessary to remove a number of rivets 24, which connect the culvert together for some distance and then spring the culvert inwardly so that it assumes the position, shown in dotted lines in Figure 5 and then force the contracted culvert end into the opening 17 and thereafter permitting the contracted culvert to assume its original position where it will be securely in engagement with the marginal flange 18. The rivets 24 are then re-inrserted in their'openings in the culvert 10.

My head wall structure is particularly designed to aflord a comparatively large opena .vention, and it is my intention to cover by my claim, and modified forms of structure or use of mechanical equivalents, which may be reasonably included within its scope' I claim as my invention:

A head wall for culvert ends adapted to be mounted upon the end of a culvert com prising a member bent to form a bottom, side and top walls, the inner ends of said bottom, side and top. walls beingcurved to form a circular opening for receiving the culvert, said top wall being bent upwardly from its inner edge for preventing dirt adjacent the head wall from passing into the culvert, a marginal corrugated flange on the inner edge of said member for enacting with and engaging the end of the culvert, a peripheral flange around the outer end of said member, said flange being wider along the bottom of said member whereby an apron is formed.

ALBERT r. FISCHER. 

